340 
ence to be noted is that the sheath is white, and not „clouded 
with chocolate-red“ as in Darwin’s specimens. 
The specimens of Darwin being badly preserved, he could 
only make out that the labrum has some strong teeth, the mand- 
ible five teeth, and the segments of the posterior cirri four pairs 
of spines. The Zamboanga specimens are in an excellent State of 
preservation, and furnish a good idea of the characters of the 
animal. 
The la brum is very characteristic, owing to the strong teet 
at both sides of the shallow notch (Fig. 73). The man di ble has 
Fig. 73. Tetraclita vitiata from Zamboanga. a labrum, b mandible 
c maxilla. [X 65]. 
five teeth, and below the lower of them a short and straight, pect- 
inate and comblike part terminating in a strongly projecting spine 
at the very lower angle. The second and the third main tooth are 
double. The outer and lower part of the blade is densely hairy, 
and on the inferior margin some longer and stouter hairs are situ- 
ated. 
The maxilla has a strong, upper spine; between this and a 
distinet notch there is a pair of somewhat shorter and slenderer 
spines. Below the notch the cutting edge carries two pairs and 
four stronger single spines; at the lower angle some short and 
straight bristles constitute a brush. Below the notch the sides of 
the blade carry finer hairs near the cutting edge. 
The anterior three pairs of cirri have somewhat bullate seg¬ 
ments with numerous spines. In cirrus I the shorter ramus with 
7 segments is half as long as the other, which has 17 segments. 
In cirrus II the rami are almost equal with 10 and 11 segments. 
